My water pipes sing at some low frequency when I shut
off the shower, and I have to partially leave the cold water
running for a few minutes to stop the noise. The problem
seems to be getting worse and yesterday the pipes sang for
a few seconds with just the cold water turned on and off.
I have 15 year old hot water heater I thought might
be the problem, but if it happens with only cold water,
I don't see the connection. I can't find any leaks,
but occasionally I get a little burst of air from one of
the hot water taps after the water has been shut off for
Do I need new pipes?